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64 lines
4.5 KiB
Markdown
64 lines
4.5 KiB
Markdown
---
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category: Components
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type: Data Display
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title: Tree
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---
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## When To Use
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Directory, organization, biological classification, country, and etc. Almost things of the world are tree structure. The `Tree` component is a way of representing the hierarchical relationship of these things，and you also can expand, collapse, select the treeNodes of it.
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## API
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### Tree props
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| Property | Description | Type | Default |
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|----------------|--------------------------------------------------|------------|---------|
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|multiple | Whether allow to select multiple treeNodes | boolean | false |
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|checkable | Whether support add Checkbox before treeNode | boolean | false |
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|defaultExpandAll | Whether default to expand all treeNodes | boolean | false |
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|defaultExpandedKeys | Specify keys of default expanded treeNodes | string[] | [] |
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|expandedKeys |(controlled) Specifies keys of expanded treeNodes | string[] | [] |
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|autoExpandParent | Whether to automatically expand a parent treeNode | boolean | true |
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|defaultCheckedKeys | Specifies keys of default checked treeNodes | string[] | [] |
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|checkedKeys |(controlled) Specifies keys of checked treeNodes（PS： When specifies a key of treeNode which is a parent treeNode, all children treeNodes of its will be checked; And vice versa, when specifies a key of treeNode which is a child treeNode, its parent treeNode will also be checked. When `checkable` and `checkStrictly` is true, it'a object has `checked` and `halfChecked` property, and no matter child treeNode or parent treeNode is checked, they won't impact on eachother. | string[] \| {checked: string[], halfChecked: string[]} | [] |
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|checkStrictly| Check treeNode precisely, parent treeNode and children treeNodes are not associated | boolean | false |
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|defaultSelectedKeys | Specifies keys of default selected treeNodes | string[] | [] |
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|selectedKeys |(controlled) Specifies keys of selected treeNode | string[] | - |
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|onExpand | Defines a function will be called when expand or collapse a treeNode | function(expandedKeys, {expanded: bool, node}) | - |
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|onCheck | Defines a function will be called when the onCheck event occurs | function(checkedKeys, e:{checked: bool, checkedNodes, node, event}) | - |
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|onSelect | The callback will be invoked when the user clicks a treeNode | function(selectedKeys, e:{selected: bool, selectedNodes, node, event}) | - |
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|filterTreeNode | Defines a function to filter treeNodes（highlight），when return true, corresponding treeNode will be highlight | function(node) | - |
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|loadData | load data asynchronously | function(node)| - |
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|onRightClick | The call back will be invoked when the user right clicks a treeNode | function({event, node}) | - |
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|draggable | Specifies whether this Tree is draggable（IE>8） | boolean | false |
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|onDragStart | Defines a function will be called when the onDragStart event occurs | function({event, node}) | - |
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|onDragEnter | Defines a function will be called when the onDragEnter event occurs | function({event, node, expandedKeys}) | - |
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|onDragOver | Defines a function will be called when the onDragOver event occurs | function({event, node}) | - |
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|onDragLeave | Defines a function will be called when the onDragLeave event occurs | function({event, node}) | - |
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|onDragEnd | Defines a function will be called when the onDragEnd event occurs | function({event, node}) | - |
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|onDrop | Defines a function will be called when the onDrop event occurs | function({event, node, dragNode, dragNodesKeys}) | - |
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### TreeNode props
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| Property | Description | Type | Default |
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|-----------|------------------------------------------|---------|---------|
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|disabled | whether disabled the treeNode | boolean | false |
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|disableCheckbox | whether disable the checkbox of treeNode | boolean | false |
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|title | title | string\|ReactNode | '---' |
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|key | it's used with (default)ExpandedKeys / (default)CheckedKeys / (default)SelectedKeys. P.S.: it must be unique in all of treeNodes of the tree! | string | internal calculated position of treeNode |
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|isLeaf | whether it's leaf node | boolean | false |
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## Note
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The number of treeNodes can be very large, but when enable `checkable`,
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it will spend more computing time, so we cache some calculations (e.g. `this.treeNodesStates`),
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to avoid double computing. But, this bring some restrictions,
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**when you load treeNodes asynchronously, you should render tree like this**。
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```jsx
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{this.state.treeData.length
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? <Tree>{this.state.treeData.map(data => <TreeNode />)}</Tree>
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: 'loading tree'}
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```
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